April in Florissant averages a daily high of 20.1°C with nights around 8.5°C. Expect roughly 11.1 wet days totalling 116.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Florissant is September–October.
Based on ST LOUIS LAMBERT INTERNATIONAL AIRPORT, MO US (6km), 1995–2024. 30 years of April data.